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Best way to run a 2.1 system
Best way to run a 2.1 system
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Old 9th May 2018, 08:53 AM   #1
astralboogie is offline astralboogie  Australia
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Default Best way to run a 2.1 system

Hi Guys

I'm running a set of 10" pa speakers with a TDA7498e and they sound very loud but they're missing that low end punch. What's the best way to add a subwoofer into the system?

Can I use a passive crossover and another class D amp to run the sub? I read in another thread that the 2 amps might interfere with each other?

Is it easier to just better to get a 2.1 board off ebay? If so any suggested boards I can run off 24v sla and a voltage booster?
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Old 15th May 2018, 04:28 AM   #2
astralboogie is offline astralboogie  Australia
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So I ended up getting a 7498 2.1 board. I've just realised that it doesn't have RCA input but has a 3 pin input. Any idea what these are called and how I can connect to it?Click the image to open in full size.
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Old 15th May 2018, 06:30 AM   #3
Nenola is offline Nenola  Finland
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There are 3-pin connectors for that but I'm not sure is it in metric or inch scale. Maybe just solder the input wires to the other side? I'm pretty sure it is a through hole-connector.
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Old 15th May 2018, 07:42 PM   #4
rollingreenhills is offline rollingreenhills
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I had this problem with a small class D amp.

Do your speakers have low pass filters on the main drivers?

That what my setup needed. Maybe that.
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Old 15th May 2018, 10:12 PM   #5
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by astralboogie View Post
So I ended up getting a 7498 2.1 board. I've just realised that it doesn't have RCA input but has a 3 pin input. Any idea what these are called and how I can connect to it?Click the image to open in full size.

In all liklihood it is a JST XH socket. (Japan Solderless Technologies). Plugs with tails can be had for cheaps on eBay. They are used extensively in model RC car/plane battery charging.


jst xh 3pin | eBay


J.
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Old 17th May 2018, 10:20 PM   #6
DreadPirate is offline DreadPirate  United States
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This should work:

Audio Signal Converter RCA Interface 3.5mm Audio Jack Socket for Amplifier Board 699966435829 | eBay

Make sure the sale includes the 3 pin cable, sometimes it doesn't.
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Old 17th May 2018, 11:29 PM   #7
astralboogie is offline astralboogie  Australia
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That's perfect! Thanks DreadPirate. I bought a couple for future projects.

The scope of this project has increased quite dramatically since I started this thread and I'm now moving in a slightly different direction. The current plan is to use minidsp 2 x 4 to do my processing (cross over and eq) running into a 4 channel sure amplifier to run 2 x tops and 2 x subwoofers. Further in the future I'd like to construct my own bass bins for improved efficiency.

I'm tossing up at the moment between 2 different 4 channel sure boards. There's 1 based off TDA7498 which I'm already familiar with but there's another based on the STA508 chip. Does anyone have any comparisons between the two? Or would there be another board that would be better? For reference all my speakers are 8ohm.

Sure Electronics' webstore 4 x 100Watt Class D Audio Amplifier Board – TDA7498
Sure Electronics' webstore 4 x 100 Watt 4 Ohm Class D Audio Amplifier Board - TK2050
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